Patents
Sitemap › H04 - Electric communication technique › H04S - Stereophonic systems › H04S 3 - Systems employing more than two channels, e.g. quadraphonic
Patents for H04S 3 - Systems employing more than two channels, e.g. quadraphonic (4,597)
09/2003
09/23/2003US6624873 Matrix-encoded surround-sound channels in a discrete digital sound format
09/18/2003WO2002019767A3 Signal processing apparatus, signal processing method, program and recording medium
09/18/2003US20030174845 Effect imparting apparatus for controlling two-dimensional sound image localization
09/12/2003WO2003075610A1 Acoustic signal transducing device and method
09/12/2003WO2003075609A2 User controlled multi-channel audio conversion system
09/11/2003US20030169886 Method and apparatus for encoding mixed surround sound into a single stereo pair
09/10/2003CN1442029A Stereo audio processing device for deriving auxiliary audio signals such as direction and centre audio signals
09/04/2003WO2003073791A2 Method and device for control of a unit for reproduction of an acoustic field
09/04/2003CA2477450A1 Method and device for control of a unit for reproduction of an acoustic field
09/03/2003EP1341394A1 Electronic audio signal processing device
09/02/2003US6614912 Sound reproducing device, earphone device and signal processing device therefor
08/2003
08/28/2003WO2003071827A2 Compact surround-sound system
08/28/2003US20030161479 Audio post processing in DVD, DTV and other audio visual products
08/26/2003US6611212 Matrix improvements to lossless encoding and decoding
08/21/2003WO2003058473A8 Interactive spatalized audiovisual system
08/20/2003EP1336323A2 Wave field synthesys sound reproduction system using a distributed mode panel
08/20/2003CN1119069C Sound field equalizer for loudspeaker system
08/19/2003US6608907 Audio output apparatus having wireless speakers
08/19/2003US6608903 Sound field reproducing method and apparatus for the same
08/14/2003WO2003067928A1 Loudspeaker room interface surround sound speaker system
08/14/2003WO2002043437A8 Wave field synthesys sound reproduction system using a distributed mode panel
08/14/2003WO2002032186A3 Method of decoding two-channel matrix encoded audio to reconstruct multichannel audio
08/14/2003US20030152236 Audio signal adjusting apparatus
08/07/2003WO2002065815A3 Sound system and method of sound reproduction
08/07/2003US20030147543 Audio amplifier unit
08/06/2003EP1332644A1 Portable multi-channel amplifier
08/06/2003CN1435074A Method and arrangement for recording and playing back sounds
07/2003
07/31/2003US20030144848 Architectural sound enhancement with pre-filtered masking sound
07/31/2003US20030144847 Architectural sound enhancement with radiator response matching EQ
07/31/2003US20030142842 Vehicle-mounted stereophonic sound field reproducer
07/31/2003US20030142833 Architectural sound enhancement with test tone diagnostics
07/31/2003US20030142830 Audio center channel phantomizer
07/31/2003US20030142814 Architectural sound enhancement with DTMF control
07/30/2003CN1116785C Multichannel active matrix sound reproduction with maximum lateral separation
07/24/2003WO2003061344A2 Multichannel echo canceller system using active audio matrix coefficients
07/24/2003WO2003061343A2 Surround-sound system
07/24/2003WO2003060559A2 Acoustic logging tool having programmable source waveforms
07/24/2003US20030138106 Method and arrangement for recording and playing back sounds
07/17/2003WO2003059005A2 Digital loudspeaker system
07/17/2003WO2003058473A1 Interactive spatalized audiovisual system
07/09/2003EP0990369B1 Sound reproduction system
07/09/2003EP0853842B1 Encoding of a plurality of information signals
07/08/2003US6590982 Wireless stereo center speaker system
07/08/2003US6588867 Reciprocal index lookup for BTSC compatible coefficients
07/03/2003US20030125933 Method and apparatus for accommodating primary content audio and secondary content remaining audio capability in the digital audio production process
07/03/2003US20030123676 Method of deriving a head-related transfer function
07/03/2003US20030123326 Acoustic logging tool having programmable source waveforms
07/02/2003CN1427987A Method and apparatus for adapting primary content of audio and remaining portion of audio content in digital audio production process
06/2003
06/26/2003WO2003053099A1 Method for improving spatial perception in virtual surround
06/26/2003US20030118198 Biaxial parametric speaker
06/26/2003US20030118192 Virtual sound image localizing device, virtual sound image localizing method, and storage medium
06/26/2003CA2467938A1 Method for improving spatial perception in virtual surround
06/25/2003CN1426669A 多通道音频转换器 Multi-channel audio converter
06/19/2003WO2002050831A3 Audio reproducing device
06/18/2003EP1320213A1 Network system and ouput device used in this system
06/18/2003EP1319962A1 Safety device for vehicles using multi-channel audio system
06/18/2003EP1319224A2 Dynamic power sharing in a multi-channel sound system
06/12/2003US20030108212 Safety device for vehicles using multi-channel audio system
06/12/2003US20030108207 Phase conversion surround circuitry
06/10/2003US6577738 Parametric virtual speaker and surround-sound system
06/05/2003US20030103637 Headphone
06/04/2003CN1422467A Use of voice-to-remaining audio (VRA) in consumer applications
06/04/2003CN1110986C AV amplifier
06/03/2003US6574339 Three-dimensional sound reproducing apparatus for multiple listeners and method thereof
05/2003
05/29/2003US20030099369 System for headphone-like rear channel speaker and the method of the same
05/21/2003EP1312242A2 Discrete multichannel audio with a backward compatible mix
05/21/2003CN1419796A Virtual sound image localizing device, virtual sound image localizing, and storage medium
05/15/2003US20030091195 Method of and apparatus for producing apparent multidimensional sound
05/14/2003EP1310139A2 Stereo audio processing device
05/08/2003US20030086577 Audio system with a phase adjustment circuit
05/08/2003US20030086572 Three-dimensional sound reproducing apparatus and a three-dimensional sound reproduction method
05/07/2003EP1013140A4 5-2-5 matrix encoder and decoder system
05/07/2003EP0963682A4 Six-axis surround sound processor with improved matrix and cancellation control
05/07/2003EP0875126A4 Surround sound processor with improved control voltage generator
04/2003
04/24/2003WO2003034788A2 Method of multiplexed audio signals
04/24/2003WO2002085068A3 Sound processing
04/24/2003US20030076966 Digital mixer capable of monitoring surround signals
04/23/2003CN1413063A Circuit equipment for converting output of two sound channels into output of six sound channels
04/17/2003US20030071839 Method of presenting adjustable multi-channel sound field when multimedia software is playing audio data
04/16/2003CN1411679A System and method for providing interactive audio in multi-channel audio environment
04/10/2003WO2003030589A2 Sound reproduction systems
04/10/2003WO2002078395A3 Method of reproducing multichannel sound using real and virtual speakers
04/10/2003WO2002041668A3 A method of and apparatus for producing apparent multidimensional sound
04/09/2003CN1409940A Multichannel audio signal processing device
04/09/2003CN1409579A Energy saving acoustic system with low cost, high electroacoustic conversion efficiency and constant playback sound pressure
04/03/2003WO2003028407A2 Method and apparatus for multichannel logic matrix decoding
04/03/2003US20030065513 Voice input and output apparatus
04/03/2003US20030063758 Microphone arrays for high resolution sound field recording
04/03/2003CA2460010A1 Method and apparatus for multichannel logic matrix decoding
04/02/2003EP1298960A2 Digital acoustic reproducing apparatus, acoustic apparatus and accoustic reproducing system
03/2003
03/27/2003US20030059057 Control system for digital sound effect and the method of the same
03/26/2003EP1295511A2 Multi-channel stereo converter for deriving a stereo surround and/or audio centre signal
03/26/2003CN1406100A Voice-frequency signal processing
03/20/2003US20030055517 Digital acoustic reproducing apparatus, acoustic apparatus and acoustic reproducing system
03/20/2003US20030053680 Three-dimensional sound creation assisted by visual information
03/20/2003US20030053634 Virtual audio environment
03/20/2003US20030053633 Three-dimensional sound reproducing apparatus and a three-dimensional sound reproduction method
03/13/2003WO2003022003A2 Audio reproducing device
03/12/2003CN1402957A Method and apparatus for deriving at least one audio signal from two or more input audio signals
03/06/2003WO2001065888A9 A system for accommodating primary and secondary audio signal
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